This study was undertaken to evaluate the effect of cultivation and fallow on the Organic Carbon (OC), Total Nitrogen (TN), and available phosphorous (P) concentration in aggregate fractions of four soils. The four soils used for the study are; Entisol, Ultisol and two Inceptisols, all collected from four different locations in Nsukka area of Southeastern, Nigeria. The land use types considered were Fallow and Cultivated. The soils collected from 0-25 cm depth were separated into five... Topics: Fallow, Cultivated, Aggregate, Fractions
Aggregates are the principal material in pavement construction. The shape of aggregate particle has significant influence on performance of the Bitumen pavement. The strength serviceability requirements of Bitumen mixes such as stability, flow, voids in mineral aggregate , voids filled with bitumen and air voids are highly depend on the physical properties of aggregate Topics: coarse aggregate, aggregate shape, DBM, VMA, VFB
byJosé Masello, Aluizio Pimentel Guedes, Luiz Antonio Gauziski de Araujo Figueredo
Masello, J., A. P. Guedes and L. A. G. d. A. Figueredo (1996). Sistema de disseminação de dados agregados do IBGE. Encontro Nacional de Produtores e Usuários de Informações Sociais, Econômicas e Territoriais (II CONFEST - IV CONFEGE), Rio de Janeiro, IBGE. Topic: Aggregate data dissemination
Nothing is so earthy, natural and so beautiful as a well executed mortared in place brick terrace, walkway or patio. However, in recent years the quality of installation has been dropping and major problems are arising that you should be aware of if you plan to have brick paving installed. Topics: Paving, Exposed aggregate
This study was undertaken to evaluate the effect of cultivation and fallow on the Organic Carbon (OC), Total Nitrogen (TN), and available phosphorous (P) concentration in aggregate fractions of four soils. The four soils used for the study are; Entisol, Ultisol and two Inceptisols, all collected from four different locations in Nsukka area of Southeastern, Nigeria. The land use types considered were Fallow and Cultivated. The soils collected from 0-25 cm depth were separated into five aggregate... Topics: Fallow, Cultivated, Aggregate, Fractions
There are many parameters of concrete thatinfluence its strength gaining characteristics. This study isan attempt to use the early compressive strength test result toestimate compressive strength at different ages. Potentialutilization of the early day compressive strength result topredict characteristic strength of normal weight concrete hasbeen investigated. A simple mathematical model capable ofpredicting the compressive strength of concrete at any age isproposed for both stone and local... Topics: concrete strength, local aggregate concrete, stone aggregate concrete, strength prediction
Waste tyre treatment is now global threat. Waste tyredumping, disposal of these materials or burning these tyrescause serious environmental and health problems. This paperinvestigate the wide range of physical and mechanicalproperties of concrete containing waste tyre aggregates andassess its suitability as a construction material. Waste tyres arepowdered into fine particles of various sizes and are used toreplace the fine aggregate used in concrete. The fine scrap tyreaggregate is added as 2%,... Topics: Rubberized concrete, scrap tyre aggregate, waste tyre aggregate, rubcrete
Waste tyre treatment is now global threat. Wastetyre dumping, disposal of these materials or burning thesetyres cause serious environmental and health problems. Thispaper investigate the wide range of physical and mechanicalproperties of concrete containing waste tyre aggregates andassess its suitability as a construction material. Waste tyresare powdered into fine particles of various sizes and are usedto replace the fine aggregate used in concrete. The fine scraptyre aggregate is added as 2%,... Topics: Rubberized concrete, scrap tyre aggregate, waste tyre aggregate, rubcrete
Sustainable construction has become an interest in the engineering community and several standards have been developed to assess the environmental impact of new construction projects. Research has shown that it is possible to use recycled materials to replace some of the traditional mixture components in concrete products and produce a more sustainable building material. Two materials that are currently recycled and have the possibility of use in concrete applications are waste glass and rubber... Topics: construction, concrete, masonry, rubber, engineering standards, aggregate
In this paper, a new polymer‐modified adhesive mortar isprepared using the fine iron tailings, eco‐cement, redispersiblelatex powder, additives and water. In thepreparation, the fine iron tailings are used to replace theriver sand as the mortar aggregate. The Orthogonalexperiment is designed to determine the optimal processconditions. The obtained results are as follows: the cementsandratio is 1:2.5, polymer‐cement ratio is 4 %, the aggregatemodulus is 0.81, and water reducing agent is... Topics: Eco‐cement, Iron Tailings, Aggregate, Adhesive Mortar
Scarcity of river sand is one of the major problemsin the construction industry. Studies were conducted to findout the feasibility of using quarry dust to partially replacesand in concrete. . These studies revealed that, due to increasedfineness, the combination require an increased water cementratio which results in strength reduction or the use of a waterreducing admixture. Use of super pozzolanic supplementarycementing materials such as silica fume, rice husk ash,metakaolin etc in concrete... Topics: fine aggregate, quarry dust, metakaolin, mortar, strength, density
Normally coarse aggregate is the fractured stone obtained from rocks in hills or pebbles from river bed. Becauseof depletion of good conventional aggregate in certain regions, the need to find out substitute materials for coarseaggregate has become imperative for environment protection. Use of recycled demolished waste is one of the solutionsbecause waste disposal problem is a growing problem. Also saving of energy requirement in construction industry with useof locally available aggregates is... Topics: Recycle Construction Aggregate, Demolished Structure, Compressive Strength, Models, Waste Concrete
Audio Freedom Daily for Feb. 12, 2014Sochi Day 4: Where are the Spectators? by David HowdenArticle at http://mises.ca/posts/blog/sochi-day-4-where-are-the-spectators/Music at http://www.jamendo.com/en/track/650283/alegriaPublished under Creative Commons Attribution-ShareAlike 2.5 CanadaPodcast MP3 Feed - http://audiofreedomdaily.com/feed/podcast/Podcast OGG Feed - http://audiofreedomdaily.com/feed/podcast_ogg/ Topics: David Howden, Mises, lack of aggregate demand, Olympics, Sochi, Economics
The differential evolution approach has become a promising optimization technique in recent decades. It has beensuccessfully applied to solve various problems in science and engineering fields; however, few applications have beenaddressed in the domain of supply chain management. In this paper, an improved DE approach is proposed for theaggregate planning problem in a supply chain. The approach comprises an improved DE variant with a winner-basedconstraint handling mechanism called the... Topics: Supply Chain Management, Operations Management, Aggregate Planning, Differential Evolution
The purpose of this study is to know the effects of coarse aggregate on the properties of concrete with the change in age of crusher screen. Location selected for the study purpose has been limited to Durg district of Chhattisgarh region. Two numbers of quarries have been selected having lime stone as a major source. Samples from both the quarries have been collected keeping in mind the age of screen age of crushers of that particular area. The study investigates various test that has been... Topics: Analytical Study, Fine and Coarse Aggregate, Sieve Analysis
This research paper presents the effect of sodium hydroxide (NaOH) present in the curing water on the strength of Recycled Coarse Aggregate Concrete(RCAC). The concrete is produced by mixing of % replacement of Natural Coarse Aggregate by Recycled Coarse Aggregate and curing water containing NaOH of 5% concentration with constant dosages.This research work describes the feasibility of using the Recycled Coarse Aggregate in concrete production as partial replacement of Natural Coarse Aggregate... Topics: Recycled Coarse Aggregate Concrete, Compressive Strength, Regression Models, Sodium Hydroxide
Plastic is everywhere in today’s lifestyle. It is used for packaging, protecting, serving, and even disposing of all kinds of consumer goods. With the industrial revolution, mass production of goods started and plastic seemed to be a cheaper and effective raw material. Hence improper disposal of plastic leads to problems like Acquisition of land under waste plastic, human problems as breast cancer, reproductive problems in humans and animals, genital abnormalities and even a decline in human... Topics: Binding, Ductility, Bitumen, Elongation, Flexible Pavement, Interlocking of Aggregate
ABSTRACT Partial and total replacement of fine aggregate in conventional concrete with quarry sand has been empirically conducted with the view too examining primarily the compressive strength of the resulting composite and possible utilization of quarry sand as fine aggregate in the production of medium grade concrete. The results of the study revealed that its specific gravity, bulk density, porosity, water absorption, silt content, the impact value and the aggregate crushing value showed... Topics: KEYWORDS: Quarry sand, fine aggregate, concrete, compressive strength, mixes.
Scarcity of river sand is one of the major problems in the construction industry. Studies were conducted to find out the feasibility of using quarry dust to partially replace sand in concrete. . These studies revealed that, due to increased fineness, the combination require an increased water cement ratio which results in strength reduction or the use of a water reducing admixture. Use of super pozzolanic supplementary cementing materials such as silica fume, rice husk ash, metakaolin etc in... Topics: fine aggregate, quarry dust, metakaolin, mortar, strength, density
R as a GIS: overlay/aggregate, rgeos, osmar, networks by Edzer Pebesma on Day 3 of the GEOSTAT 2012 at the University Muenster in Muenster, Germany. See http://geostat-course.org/Muenster_2012 If you download the videos and play them locally the quality (especially sound quality) may improve! For general information on GEOSTAT courses visit http://geostat-course.org/ Topics: GEOSTAT, R, as, a, GIS, overlay, aggregate, rgeos, osmar, networks, Muenster
An excellent road network is an asset to any developing country and India in particular as it is one of the largest countries in the world and a perfect road network would complement its development. The road transport forms the arterial infrastructure to facilitate trading and transport of passengers and commodities. A flexible pavement which is the mostly used form of pavement has four component layers namely surface, subgrade, Sub-base and Base courses. Which are comprised of materials like... Topics: Pond Ash, Recycled Aggregate, CBR, Void Ratio, Sub-Base, Base-Course
Public Expenditure Management (PEM) is a tool designed by the World Bank to ensure effectiveness and efficiency of public resources by various governments of the globe. PEM cannot be used in isolation of financial management; rather it is used to formulate an efficient budget of any given country. The life cycle of the Nigerian budget has ever been in question, necessitating issues regarding when the national budget starts on one hand, and when it ends on the other. Under normal circumstance,... Topics: Aggregate Fiscal Discipline, Allocative Efficiency, Budget Estimates, Public Expenditure...
The waste generated from the industries cause environmental problems. Hence the reuse of this waste material can be emphasized. To produce low cost concrete by replacing fine aggregate with stone waste(marble and granite) and to reduce disposal and pollution problems due to the use of stone waste. It is most essential to develop low cost building materials from stone waste. The innovative use of stone waste in concrete by replacing fine aggregate with this material was the other alternative of... Topics: Compressive Strength, Flexural Strength, Split Tensile Strength, Permeability, Replacement of Fine...
byAmir Rezaei B., Ebrahim M. Kolahdouz, Gary F. Dargush, A. Scott Weber
One of the most recently developed ground source heat pump (GSHP) models which accounts for real-time, comprehensive surface energy balance phenomena, was modified in this paper to obtain the solution for a non-homogeneous domain. Alternating direction implicit and fully explicit finite difference methods were utilized and numerical results were compared to field measurements. The developed model was then used to evaluate effectiveness of an intermediate insulation layer obtained from tire... Topics: Ground source heat pump, tire derived aggregate, alternating direction implicit, non-homogeneous,...
byAmir Rezaei-Bazkiaei, Ehsan Dehghan-Niri, Gary F. Dargush, A. Scott Weber
An effective control strategy with a non-homogeneous soil profile for horizontal Ground Source Heat Pumps (GSHPs) was investigated in this paper. Steps toward development of a comprehensive model to consider the effects of an intermediate blanket on top of the ground pipes were described. The model incorporates the effects of a variety of surface energy fluxes to provide an accurate estimate of the ground thermal regime. The developed model was successfully utilized in conjunction with the... Topics: Ground source heat pump, tire derived aggregate, non-homogeneous, optimization, genetic algorithm,...
This paper is an attempt to establish the acceptability of demolished concrete waste aggregate to make self compacting concrete of very high strength and desirable properties. It addresses experiments on two types of self compacting concrete – one with fresh coarse and fine aggregates while the other with 100% replacement of fresh coarse aggregate with recycled one. Results showed that the fresh and hardened properties of both the concretes were comparable. The stigma with recycled aggregates... Topics: Ground Granulated Blast Furnace Slag (GGBS), Recycled Aggregate, Rheological Properties, Self...
Web server logs have abundant information aboutthe nature of users accessing it. The analysis of the userscurrent interestbased on the navigational behavior may helpthe organizationsto guide the users in their browsing activityand obtain relevantinformation in a shorter span of time.Web usage mining is used to discover interesting usernavigationpatterns and can be applied to many real-worldproblems, such as improving Web sites/pages,makingadditional topic or product recommendations,... Topics: Aggregate Usage Profile, Least SquareApproach, Web Personalization, Recommender Systems,...
The third installment of the Aggregate series. Cover art by Soufiane Mengad. Used with permission. Check out more artwork at soufianemengad.com Topics: esoteric, aggregate, ambient, classical pop, space, Out Of Orion (Ox3), Yamal, Pamlico
Starting up a new series of CDs with Esoteric Aggregate 1.0. Contains an extended version of Black Knight Satellite. Cover art by ligolai at ligolai.deviantart.com Topics: collection, aggregate, esoteric, MH 370, St. Martin's Land, ambient, techno, space, classical pop
The second in the Esoteric Aggregate collection. Cover by Soufiane Mengad. Check out more awesome art at soufianemengad.com. Topics: esoteric, aggregate, classical pop, middle eastern, faeries, templar, sirius, machu picchu
This publication provides a detailed description of the sources and methods used by OECD member countries in calculating the monetary aggregates, credit and other measures of domestic finance presented in Main Economic Indicators. Topics: data, credit, monetary, bank, banks, deposits, aggregate, series, sources, indicators, monetary... Source: http://books.google.com/books?id=14DWAgAAQBAJ&hl=&source=gbs_api